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Credit: AFP/Getty Images

DETROIT, UNITED STATES: Former lead singer of Led Zeppelin, Robert Plant, speaks at General Motor Corp. Cadillac division as it celebrated its 100th birthday party at their headquarters in the Renaissance Center in Detroit 22 August, 2002. In 1902 Henry M. Leland founded Cadillac Motor Car. Cadillac uses Led Zeppelin music in their commercials. AFP Photo/Jeff KOWALSKY (Photo credit should read JEFF KOWALSKY/AFP/Getty Images)